Abstract: A storage controller is disclosed which may emulate several types of specialized host specific and/or storage device specific storage controllers. The storage controlling system can transfer information between one or more different types of target units and one or more channels of at least one host. The system is provided with a computer, which includes a first interface, a second interface, and a programmable storage controller. The first interface is configured to receive one or more channel adapters which carry one or more channel programs transmitted from the channels of the host. The channel programs may carry data, status information, and commands. The second interface allows input and output to storage facilities which comprise one or more target units. The programmable storage controller may be provided with a device coupled to the channel adapters for translating channel program commands, and determining, from the channel program, a target unit for which at least one channel program is transmitted.

Abstract: An apparatus for storing data is disclosed, which has a storage medium support frame for supporting storage medium carrying members of similar configuration. The size of the storage medium support frame can be changed (i.e., adjusted) to accommodate an arbitrary number of storage medium carrying members. In one embodiment, the storage medium carrying member may be in the form of a rewritable optical disk or another type of optical storage platter. The storage medium support frame comprises a plurality of disk units which may be coupled to each other, each disk unit having a disk support structure for supporting at least one platter. The disk units are provided with mechanisms for detachably connecting, and thereby stacking, a variable number of disk units together to form the storage medium support frame. As the disk units are stacked, i.e.

Abstract: A sprocket assembly with replaceable teeth including a generally cylindrical sprocket equipped with a plurality of L-shaped pockets in the periphery thereof for the receipt of a tooth having an inner end equipped with a partial T-shape and wherein wedge lock means operate against the T-shape to cooperate with the chain force in maintaining the seat of the tooth within the pocket.